media: Convert I420 VideoFrame to UYVY GpuMemoryBuffer.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 41f5dc7a058016879d1ef3907185d95f18bc457c..c027a423e0194c682f2a05c2b57b2b1ef8149645 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1363,9 +1363,14 @@ RenderThreadImpl::GetGpuFactories() {
                                  "gpu_channel_. See crbug.com/495185.";
     CHECK(gpu_channel_host.get()) << "Have gpu_va_context_provider but lost "
                                      "gpu_channel_. See crbug.com/495185.";
+    media::VideoPixelFormat video_pixel_format = media::PIXEL_FORMAT_I420;
+#if defined(OS_MACOSX)
+    // TODO(dcastagna): Check that the extension is available.
+    video_pixel_format = media::PIXEL_FORMAT_UYVY;
+#endif
     gpu_factories = RendererGpuVideoAcceleratorFactories::Create(
         gpu_channel_host.get(), media_task_runner, gpu_va_context_provider_,
-        image_texture_target, enable_video_accelerator);
+        image_texture_target, video_pixel_format, enable_video_accelerator);
   }
   return gpu_factories;
 }